Simple Garage Alarm Circuit

2015-01-10 04:20

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Here is garage or shed alarm circuit. This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays. It’s designed to be used with the usual types of normally-closed input devices such as – magnetic-reed contacts – micro switches – foil tape – and PIRs. t has an extremely small standby current – making it ideal for battery-powered operation. I’ve used a 9-volt battery in the diagram – but the circuit will work at anything from 5 to 15-volts. Just choose a relay and Siren suitable for the voltage you want to use. It’s easy to use. To set the alarm move SW1 to the “set” position. You now have about 10 to 15 seconds to leave the building. When you return and open the door – the green LED will light. Here is a schematic drawing:

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